Bearing for shafts.



J. M. BURBY1 BEARING FOR SHAFTS,

APPLICATION TILED MAY 8, 1311 1,019,300. Patented Mar. 5, 1912.

witnesses:

steam or other expansible fluid is ASSIGNM NTS, T0 or new roan.

LMLQSOU.

To all whom it may concern.

Be it known that I, JOHN. M. BURBY, a citizen of the United States, and a resident of Long Island City, county of Queens, and State of New York, have invented certain new and useful Improvements in Bearings for Shafts, of which the following is a full, clear, and 'exact, specification, reference being had to the accompanying drawings, wherein- Figure 1 is a sectional view, partly elevation, of such a bearing; Fig. 2 is a similar view of such a bearing showing the means for holding the shaft against lateral displacement; Fig. 3 is the sectional view, partly elevation, of a bearing of a rotary drier; the stationary steampipe, connecting therewith, being journaled therein accord- "ing to the principle of my invention; Fig. 4:

is a detail sectional view showing a modified form of constructing "the box.

The object of my invention is to provide a bearing, known as a stufling box, for a shaft, extending into a device, wherein kept under compression, so that the bearing will permit of. an easy operation of the shaft without undue friction, and yet effectively prevent the escape of the, expansive fluid therethrough, or, as for instance, in the,case of propeller shafts, the leaking of water into the boat. This object is accomplished by the construction of such a bearing as herein shown anddescribed. Y

Referring to the drawings, the box a is shown in Figs. 1" and 2, formed integral with the wall of the casing, wherein the expansive fluid is confined, the shaft 6 being journaled in the aperture 6 of the casing, and in the aperture it, provided for it in the follower-h-closing the box. Assuming that the casing contains steam under pressure,\ this steam, unless restrained, will be forced along the shaft 6 and esca e .through the aperture 6' in the casing. o prevent this, I provide, in the box a, a recess a, extending for a proportionate distance from the bottom of the interior cavity at of the box a and suitable means for closing it practically air-tightly. Recess 0' is smaller in diameter than the interior d of the box a and approximately concentrically located therein, and

this produces an annular shoulder e, whereon the metallic washer f, snugly fitted into the box, rests when driven in to close the JOHN M. BURBY'coMr? Speciflcation'of Letters Patent. I Application filed May 8, 1911.-

of asbestos fiber JOHN M. hunter, erroneiISLAND ciraiaawmax, assisnon, BY DIRECT AND MXEYSNE ANY, or NEW YORK, n. Y., A CORPORATION BEAnInsr FOR SHAFTS. Z

Serial No. 625,933.

recess 0. This washer f is perforated and Slld on the shaft 6, the shaft being free to rotate therein. Next to this washer f, a

Patented Mar. 5,1912.

layer of compressible packingg, preferably combined with graphite,.is set, and'the follower It, comprising a plug entering the box, and a cover for it, is pressed upon the packing 9, when it is secured upon the box a by screwing the nuts 2" upon the screws 2'. The packing gis snugly fitted upon the shaft 6 and is compressed by the screwing on,'of the nuts 2", upon the screws 2'. Thereby also the metallic washer f is pressed upon the annularshoulder e and forms, with the recess a, a practically airtight chamber. To my understanding, the air confined in the-recess 0' is thereby to some extent compressed, and this compressed air materially assists in holding the expansive fluid confined within the casing. .I also be-- lieve that whatever, if any of the expansive fluid is forced around the shaft 6 into the chamber 0,; condenses, andgradually replacing the air therein, acts as a water seal, preventing any further escape of the expansive fluid from the casing. In any event, I have satisfied myself by use of such shaft bearings, as herein shown and described, that it does e'fiectively prevent leaking or escapeof the expansive fluid from the casing, and that the shaft thus journaled, is not subject to any apprehensible friction.

To hold the shaft 6 against lateral displacement, I provide the collar is, which may be made integral therewith, or 'otherwise rigidly secured thereto. This collar is smaller in its dimensions than the interior dimensions of the recess or chamber .0 and is so set on the'shaft, that when the bearing is assembled, this collar is is locatedwithin the recess or chamber 0 as'shown in Fig. 2. In this arrangement ing, the shaft 6 is heldagainst lateral dispacement, so-called creeping, and-I have.

und that the'air or condensation with n the chamber 0, keeps the collar tacting with either the wall of the recess a or with the metallic washer f and that no additional friction is produced thereby.

Fig. 3 of the drawings illustrates the application of my invention to-the coupling of a hollow ier bearing with a stationary steam pipe. In the construction of this coupling, the same 70 from con- 0 any improved bearconditions are to be met in vrespect to preventing the escape 'volve. It is, however,

of the steam, as in the bearing shown in Figs. 1 and 2, the only difference being, that in the construction shown in Figs. 1 and .2, the shaft rotates, whereas in the construction shown in Fig. 3, the bearing rotates with the drier, the steam pipe being stationary. To this end extended to -form the hrb a for the drier, whereby the latter is supported in standard 5 and to form the box a, the recess or chamher a, and the annular shoulder e surrounding it. The box a may be made separately in the form of a hollow, interiorly recessed ring a and is screwed on, onto the hub 0, as shown in detail. in Fig.4. The box also contains the recess or chamber 0, the metallic washer f is snugly fitted into'its interior d and the packing g follower h, thereby closing metically for all practical purposes.

the box a her- .this construction the followerh is provided with an interiorly screw-threaded circular the box a, cylindricalin shape, being correspondingly screw-threaded exteriorly. Thus-the follower 'is secured to the box a by being screwed thereon and itupon the as in the construction, shown in Figsl and 2, is done by screwing on the nuts z" upon the screws 2". This form of constructing the box and the follower is preferable for the stated purpose, in view of the circumstance, that the box rotates, and it is, therefore, advisable to avoid using the screws 2', as shownin Figs. 1 and- 2, on account of the danger it would inthereby its plug driveninto ploy this form of construction, and any other suitable way of fastening the follower h upon the box a so 'as to compress the packing g thereby, may be employed. The pipe 1 may also be provided with a collar is to hold it against lateral displacement relatively to the drier, its function andmode of operation are the same as explained with reference to the collar 70 in the construction shown in Fig. 2. It is,.however, not necessary to employ thecollar k if the pipe [is otherwise held against lateral displacement. I

I claim as my invention:

1. A shaft bearing comprising a box, a

theside wall of the drier a is.

and upon the shaft to is compressed by the 'ing thereby, substantially as not essential to em-,.

into the box and upon recess; a layer .a washer fitted into the i means for closingithe box, compressing the packing and driving the washer to close the recess, substantially described. 2. A shaft bearing comprising a box, a recessin the'box, a washer fitted into the box close the recess; a follower; a layer of compressible packing, slid on the shaft between the washer and the follower, and means for securing the follower upon the box and so as to compress thereby the packing, substantially as herein shown and described.

3. A shaft bearing comprising a box, a recess in thebox, box and upon the shaft to close the recess; a follower; a layer of compressible packing, slid on the shaft between the washer and the follower; means for securing the followerupon the box and so as to compress the packing thereby, and means for holding the shaft against lateral displacement in the bearing, substantially as herein shown and described. l

4. A shaft bearing comprising a box, a recess in the box, a collar on the shaft within the recess; a washer fitted into the box and upon the shaftto close therecess; a follower; a layer of compressible packing, slid on the shaft between the washer and the follower; and means for driving the follower into the box to compress the packand described I.

5 A shaft bearing comprising a box, a recess in the box, a collar of smaller dimenas herein shown and herein shown a washer fitted into the sions than the interior dimensions .of the recess, secured on the shaft; a washer fitted the shaft to close the of compressible packingset in the box and upon the. washer; a cover and means compressing the packing by securing the cover upon the box, substantially as herein shown and described.

' JOHN M. Witnesses:

' J OHN H. HENSHAW,

'VERONICA BMW.

count. 

